The pitchblack Portable is a guitar/bass polyphonic tuner that provides speedy and accurate tuning. The pitchblack Portable features a high-brightness LED display which provides excellent visibility, so that the pitch drift of each string is instantly and clearly visible. Korg's proprietary cable checker function is also built-in, letting you easily check for broken cables; making this unit the ideal choice for stage or studio use. The pitchblack portable lineup gives you a choice of three models: aluminum black, aluminum red, and aluminum silver. With an accuracy of +/-0.1 cents, the pitchblack Portable delivers a significant advance in guitar/bass tuning.